Definition of radar in US English:

radar

noun

  • 1A system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of high-frequency electromagnetic waves that are reflected off the object back to the source.

    • ‘After all, they argued, how can anyone seriously think photo radar will reduce speeding?’
    • ‘The boats had such a low profile and were so quick that they could be within seven miles before radar detected them.’
    • ‘Part of the reason was that corporate cost cutting had left the ship without radar.’
    • ‘These systems use radar as the surveillance and cueing sensor to achieve this.’
    • ‘The flares are fired when the crew detect, by radar, they are being chased by a missile homing in on the hot exhaust of the plane.’
    • ‘The officer must have visual estimation of speed before using radar to confirm it.’
    • ‘Lidar is a remote sensing technique that uses laser light in much the same way that sonar uses sound or radar uses radio waves.’
    • ‘Digital cellphones are similar to radar, using pulses carried by microwaves.’
    • ‘The robot warriors use GPS, radar, laser radar and a host of other technologies to move without human aid.’
    • ‘That expelling of exhaust is vital in detecting their presence on radar.’
    • ‘To an extent, higher speeds can also make aircraft more visible to radar and susceptible to threats.’
    • ‘If someone did try to destroy us we'd detect it on radar before we were hit and could send a blast straight back.’
    • ‘Most of us who drive cars have grown up since the advent of radar to detect speeding.’
    • ‘The development of radar to intercept aircraft and direct gunfire revolutionized the Allied bombing offensive.’
    • ‘Chavez reported that Venezuelan radar detected the presence of the ships and planes during the coup attempt.’
    • ‘Solid-state phase shifters steer optical beams for laser communications and radar.’
    • ‘The MCA said the study looked for impacts on compasses and various kinds of communications and positioning systems as well as radar.’
    • ‘Using radar, the Protector system becomes active only after the driver has failed to react.’
    • ‘You even see a form of radar at many grocery stores when the doors open automatically!’
    • ‘Its advanced stealth features help prevent the aircraft from being detected by radar.’
    1. 1.1 An apparatus used for radar.
      • ‘Our radars indicate a multitude of small incoming fighters.’
      • ‘Adjusting his grip on the controls, he began to veer away from the colony, lest he be detected by their radar.’
      • ‘Before these radars can become operational, the air force can use a medium-range unit with a range of 1,000 km.’
      • ‘It's a network of radars and defensive missiles that will begin operating, at least some of them will, by 2004.’
      • ‘It hovers high above the clouds and literally no radar can detect it because of its wind-elemental cloak.’
      • ‘‘Some of the radars needed to track the incoming missile are not yet ready,’ says Marchildon.’
      • ‘The system uses the ship's three dimensional circular scan radar for target tracking.’
      • ‘An additional limb in front is equipped with a metal detector and radar to find mines, a second sprays paint on the ground to mark the spot.’
      • ‘Park Air is a world leader in the field of integration, processing and display of data from radars, sensors and databases.’
      • ‘Once Saki broke through the atmosphere, the ship's radar picked up an approaching craft.’
      • ‘Our helicopters will rain fire down upon your camps before you detect them on your radar.’
      • ‘An incoming missile attack will initially be detected by the ship's long-range surveillance radar.’
      • ‘The Patriot's radar sends out electronic pulses that scan the air space above it.’
      • ‘Keep an eye on those radars, and listen to whatever is being said.’
      • ‘Invading foreign computer networks could shut down radars and electrical plants and disrupt telephone lines without firing a shot.’
      • ‘Our mission was to look for hostile radars as they became active.’
      • ‘Lo said the vessel's automatic navigation system and radar were damaged during the attack.’
      • ‘Also in Alaska, there will be upgraded equipment and new radars for early warning.’
      • ‘Cyclone detection doppler radars are replacing the conventional analogue radars in important locations along the east coast.’
      • ‘The radars use high frequency and advanced radar signal processing technology to improve target resolution.’
    2. 1.2 Used to indicate that someone or something has or has not come to the attention of a person or group.
      ‘the band has been kind of off the radar these past few years’
      • ‘The bulk of the victims appear to be ordinary people who happen to have strayed across the media's radar.’
      • ‘Winterland, a little CD released in the mid-80's and since having fallen under the radar, is one of the purest pleasures in the Hendrix catalog.’
      • ‘You may not know what you need, but at least by asking nightly, your radar will be wide open.’
      • ‘For Potterton and Dempsey, the deals must seem like minute blips on a large radar.’
      • ‘Going into the home stretch, the 2nd District race finally made it onto the national political radar.’
      • ‘From a finance standpoint, Telemundo is the merest blip on GE's radar.’
      • ‘The new Russia is out to prove something, and I think Africa features prominently on their radar.’
      • ‘With the exception of Moldova, this year's performances don't rate a blip on the comedic radar compared to last year.’
      • ‘Just a couple of things we want to put on your radar, certainly on our radar, this morning.’
      • ‘I wonder if there are lots of other conflicts dragging on in other regions below the media radar.’
      • ‘We moved over to a network that had a lot of other problems, which were sometimes good for us because we were not on their radar.’
      • ‘Inner space has become a playground for uber-rich billionnaire tourists, and outer space is pretty much off the radar.’
      • ‘Next, and this almost slipped under the radar, Craig paid nearly a quarter million dollars in legal fees with his campaign fund.’
      • ‘It probably didn't cross their radar, as often happens with celebrity figures who have never presented themselves primarily as romantic characters.’
      • ‘It rarely raises a blip on the international radar.’
      • ‘The big boys are on a merger binge that is paralyzing the industry and bumping fledgling and mid-range artists off the radar.’
      • ‘His private life better known in Britain than here at home has not appeared on the radar of the Canadian media.’
      • ‘But there's often more egregious abuse among the tiny nonprofits that operate below the radar.’
      • ‘For every person like this, there are probably a dozen or more false teachers flying under the media's radar.’
      • ‘Yet Bad Dreams, at least for me, flew under the radar.’

Origin

1940s: from ra(dio) d(etection) a(nd) r(anging).

Pronunciation

radar

/ˈreɪˌdɑr//ˈrāˌdär/